Int J Prosthodont. 2019 Mar/Apr;32(2):174-176. doi: 10.11607/ijp.6080.
To assess the biologic and technical responses to cemented and screw-retained all-ceramic single-tooth implant-supported reconstructions at 3 years postinsertion.
Thirty-four patients with single-tooth implants were randomly restored with either a cemented lithium disilicate crown on a customized zirconia abutment (CEM) or a screw-retained crown with a directly veneered zirconia abutment (SCREW). At baseline examination and after 3 years of loading, marginal bone level and technical parameters were assessed. Differences in marginal bone loss were tested using Mann-Whitney U test at baseline and at 3 years, and changes within each group between baseline and 3 years were tested using Wilcoxon signed rank test.
The median changes between baseline and the 3-year follow-up amounted to -0.1 mm (CEM; intragroup P = .36) and -0.0 mm (SCREW; intragroup P = .58). Intergroup comparisons did not reveal statistically significant differences at 3 years (P = .20) or over time (P = .70).
At 3 years, screw-retained and cemented reconstructions rendered largely the same radiographic and technical outcomes.
评估 3 年后黏固和螺丝固位全瓷单牙种植体支持修复体的生物学和技术反应。
34 名单牙种植体患者随机采用定制氧化锆基台黏固硅酸锂陶瓷冠（CEM）或直接上瓷氧化锆基台螺丝固位冠（SCREW）修复。在基线检查和 3 年负载后，评估边缘骨水平和技术参数。使用 Mann-Whitney U 检验在基线和 3 年时检验边缘骨丢失的差异，使用 Wilcoxon 符号秩检验检验每个组内从基线到 3 年的变化。
从基线到 3 年随访的中位数变化分别为 -0.1mm（CEM；组内 P =.36）和 -0.0mm（SCREW；组内 P =.58）。3 年时的组间比较（P =.20）和随时间的比较（P =.70）均无统计学差异。
3 年后，螺丝固位和黏固修复体在影像学和技术结果上大致相同。
